feat: option to emit event to bus upon message sent

[adklempner]

Description

Adds an option when creating message sender to emit an event each time a message is sent.

Changes

• new option WithMessageSender which instructs MessageSender to push an event to the EventBus each time a message is sent
• new event MessageSent containing timestamp and payload size

Tests

Added a new unit test and tested locally in status-go via this PR status-im/status-go#6157

[status-im-auto]

Jenkins Builds

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❔	Commit	#️⃣	Finished (UTC)	Duration	Platform	Result
✔️	86c0a99	#1	2024-11-29 02:20:12	~2 min	unknown	📄log
✔️	bfd8616	#2	2024-11-29 02:49:58	~2 min	unknown	📄log
✔️	afe7ed1	#3	2024-11-29 03:45:51	~2 min	unknown	📄log
✔️	af6dfb6	#4	2024-12-03 01:29:08	~2 min	unknown	📄log

❔	Commit	#️⃣	Finished (UTC)	Duration	Platform	Result
✔️	9854507	#5	2024-12-03 01:51:25	~2 min	unknown	📄log
✔️	e42da3a	#6	2024-12-03 03:08:00	~2 min	unknown	📄log

[chaitanyaprem]

change LGTM, but test needs to be fixed that is failing.

probably due to invoking wg.wait in a go routine.

[adklempner]

change LGTM, but test needs to be fixed that is failing.

probably due to invoking wg.wait in a go routine.

fixed, the problem was not closing the subscription (it got triggered after the test ended making it fail)